2011 INFINITI QX56 brake

BRC-158
< REMOVAL AND INSTALLATION >[INTELLIGENT BRAKE ASSIST]
IBA OFF SWITCH
REMOVAL AND INSTALLATION
IBA OFF SWITCH
Removal and InstallationINFOID:0000000006228305
REMOVAL
1. Remove instrument lower panel. Refer to
IP-13, "Exploded View".
2. Disengage the pawl. Then remove IBA OFF switch.
INSTALLATION
Install in the reverse order of removal.
Revision: 2010 May2011 QX56

BRM-14
< PREPARATION >
BODY COMPONENT PARTS
NOTE:
 For the parts without a number described in the figure, it is supplied only with the assembly part that the part is included with.
 Tensile strength column shows the largest strength value of a part in the component part.
CAUTION:
If the high strength steel (ultra high strength steel) of this is broken, replace by assembly for the supply part. No. Parts name
Tensile strength
(MPa) Both sided anti-corrosive
precoated steel sections
1. Frame assembly Refer to No.2−36
2. Front bumper crossmember assembly T=1.8 mm
(0.071 in)
980
caution—
3. 2nd crossmember assembly 440 —
4. 2nd crossmember reinforcement (RH & LH) 440 —
5. 1st cab mounting bracket (RH & LH) Under 440 —
6. Front side member assembly (RH & LH) 540 —
7. Front suspension bracket assembly (RH & LH) Under 440 —
8. Engine mounting bracket assembly (RH & LH) Under 440 —
9. 2nd cab mounting bracket assembly (RH & LH) Under 440 —
10. 3way connector bracket assembly (RH & LH) Under 440 —
11. Piping bracket assembly (RH & LH) Under 440 —
12. Front bound bumper bracket assembly (RH & LH) 540 —
13. Lower front link mounting bracket assembly (RH & LH) 440 —
14. Diagonal member complete (RH & LH) 540 —
15. Rear engine mounting gusset assembly Under 440 —
16. Rear engine mounting member complete Under 440 —
17. Front fuel tank protector (RH & LH) Under 440 —
18. 3rd cab mounting bracket assembly (RH & LH) Under 440 —
19. Center side member assembly (RH & LH) 540 —
20. 6th crossmember assembly Under 440 —
21. Exhaust bracket (Front) Under 440 —
22. Fuel tank protector (RH & LH Rear) Under 440 —
23. Heat insulator bracket Under 440 —
24. Fuel tank protector assembly (RH & LH) 540 —
25. Rear suspension mounting bracket assembly (RH & LH) 540 —
26. 4th cab body mounting bracket assembly (RH & LH) Under 440 —
27. Rear brake hose bracket (RH & LH) Under 440 —
28. Rear shock absorber bracket assembly (RH & LH) 540 —
29. Rear side member assembly (RH & LH) 540 —
30. 5th cab body bracket (RH & LH) Under 440 —
31. 7th crossmember assembly Under 440 —
32. Exhaust bracket (Rear) Under 440 —
33. Spare wheel crossmember assembly Under 440 —
34. Front under cover bracket assembly Under 440 —
35. Rear end gusset (RH & LH) 440 —
36. Rear end crossmember assembly 540 —
Revision: 2010 May2011 QX56

BRM-22
< REMOVAL AND INSTALLATION >
BODY CONSTRUCTION
BODY CONSTRUCTION
Body ConstructionINFOID:0000000006248495
1. Outer side body 2. Upper front pillar hinge brace 3. Weld nut
4. Upper inner front pillar 5. Parking brake bracket 6. Hoodledge reinforcement
7. Upper hinge plate 8. Weld bolt 9. Side dash
JSKIA1894ZZ
Revision: 2010 May2011 QX56

BRM-56
< SERVICE DATA AND SPECIFICATIONS (SDS)
BODY ALIGNMENT
Unit: mm (in)
Rear BodyINFOID:0000000006248512
Measurement
Dimensions marked with ″*″ indicate symmetrically identical dimensions on both the right and left hand of the
vehicle.
Measurement Points
: Vehicle front
Point Material Point Material
A Cowl top positioning mark of center positioning
mark H, h, J, j, K, k,
M, m
Center pillar indent
B, b Roof indent O, o, P, p Rear fender indent
C, c Front pillar joggle Q, q Parking brake bracket hole center φ13 (0.51)
D, d, E, e, N, n Outer side body indent R, r 2nd seat mounting front crossmember hole cen-
ter
φ7 (0.28)
F, f, G, g Front pillar indent S, s, T, t, U, u,
V, vDoor hinge installing hole center
S, s, U, u:
φ9 (0.35)
T, t, V, v: φ12 (0.47)
Unit: mm (in)
JSKIA1902GB
Revision: 2010 May2011 QX56

CCS-2
WIRING DIAGRAM .....................................57
INTELLIGENT CRUISE CONTROL ............... ...57
Wiring Diagram .................................................... ...57
BASIC INSPECTION ...................................69
DIAGNOSIS AND REPAIR WORK FLOW ..... ...69
Work Flow ............................................................ ...69
ADDITIONAL SERVICE WHEN REPLACING
ICC SENSOR .....................................................
71
Description ........................................................... ...71
Work Procedure ......................................................71
LASER BEAM AIMING ADJUSTMENT ............72
Description ........................................................... ...72
Work Procedure (Preparation) ................................72
Work Procedure (Setting The ICC Target Board) ...72
Work Procedure (Laser Beam Aiming Adjustment)
...
75
ACTION TEST ...................................................77
Description ........................................................... ...77
Work Procedure (Vehicle-To-Vehicle Distance
Control Mode) .........................................................
77
Work Procedure [Conventional (Fixed Speed)
Cruise Control Mode] ..............................................
80
DTC/CIRCUIT DIAGNOSIS ...................... ...83
C1A00 CONTROL UNIT ................................. ...83
ADAS CONTROL UNIT ......................................... ...83
ADAS CONTROL UNIT : DTC Logic ......................83
ADAS CONTROL UNIT : Diagnosis Procedure ......83
ICC SENSOR ......................................................... ...83
ICC SENSOR : DTC Logic .....................................83
ICC SENSOR : Diagnosis Procedure .....................83
C1A01 POWER SUPPLY CIRCUIT 1, C1A02
POWER SUPPLY CIRCUIT 2 ............................
85
ADAS CONTROL UNIT ......................................... ...85
ADAS CONTROL UNIT : DTC Logic ......................85
ADAS CONTROL UNIT : Diagnosis Procedure ......85
ICC SENSOR ......................................................... ...85
ICC SENSOR : DTC Logic .....................................85
ICC SENSOR : Diagnosis Procedure .....................86
C1A03 VEHICLE SPEED SENSOR ..................87
DTC Logic ............................................................ ...87
Diagnosis Procedure ..............................................87
C1A04 ABS/TCS/VDC SYSTEM .......................89
DTC Logic ............................................................ ...89
Diagnosis Procedure ..............................................89
C1A05 BRAKE SW/STOP LAMP SW ...............90
DTC Logic ............................................................ ...90
Diagnosis Procedure ..............................................90
Component Inspection (ICC Brake Switch) ......... ...93
Component Inspection (Stop Lamp Switch) ............93
C1A06 OPERATION SW ...................................94
DTC Logic ............................................................ ...94
Diagnosis Procedure ...............................................94
Component Inspection ............................................95
C1A12 LASER BEAM OFF CENTER ...............96
ADAS CONTROL UNIT .......................................... ...96
ADAS CONTROL UNIT : DTC Logic ......................96
ADAS CONTROL UNIT : Diagnosis Procedure ......96
ICC SENSOR .......................................................... ...96
ICC SENSOR : DTC Logic ......................................96
ICC SENSOR : Diagnosis Procedure .....................96
C1A13 STOP LAMP RELAY .............................97
DTC Logic ............................................................ ...97
Diagnosis Procedure ...............................................97
Component Inspection ..........................................102
C1A14 ECM ......................................................103
DTC Logic ............................................................ .103
Diagnosis Procedure .............................................103
C1A15 GEAR POSITION .................................104
Description ........................................................... .104
DTC Logic .............................................................104
Diagnosis Procedure .............................................104
C1A16 RADAR STAIN ................................... ..106
ADAS CONTROL UNIT .......................................... .106
ADAS CONTROL UNIT : DTC Logic ....................106
ADAS CONTROL UNIT : Diagnosis Procedure ....106
ICC SENSOR .......................................................... .106
ICC SENSOR : DTC Logic ....................................106
ICC SENSOR : Diagnosis Procedure ...................107
C1A17 ICC SENSOR ........................................108
DTC Logic ............................................................ .108
Diagnosis Procedure .............................................108
C1A18 LASER AIMING INCMP .......................109
ADAS CONTROL UNIT .......................................... .109
ADAS CONTROL UNIT : DTC Logic ....................109
ADAS CONTROL UNIT : Diagnosis Procedure ....109
ICC SENSOR .......................................................... .109
ICC SENSOR : DTC Logic ....................................109
ICC SENSOR : Diagnosis Procedure ...................110
C1A21 UNIT HIGH TEMP .................................111
ADAS CONTROL UNIT .......................................... .111
ADAS CONTROL UNIT : DTC Logic ....................111
ADAS CONTROL UNIT : Diagnosis Procedure ....111
ICC SENSOR .......................................................... .111
ICC SENSOR : DTC Logic ....................................111
Revision: 2010 May2011 QX56

CCS
COMPONENT PARTSCCS-9
< SYSTEM DESCRIPTION > [ICC]
C
D
E
F
G H
I
J
K L
M B
N P A
SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts LocationINFOID:0000000006224265
1. ICC steering switch 2. Information display, ICC system warning lamp, IBA OFF indicator
lamp, buzzer
(On the combination meter)3. BCM
Refer to BCS-4, "
BODY CONTROL
SYSTEM : Compon ent Parts Loca-
tion"
4. Transfer control unit
Refer to DLN-10, "
Component Parts
Location"
5. ICC brake hold relay 6. ECM
Refer to EC-16, "
Component Parts
Location"
7. ICC sensor 8. TCM
Refer to TM-10, "
A/T CONTROL
SYSTEM : Compon ent Parts Loca-
tion"
9. ABS actuator and electric unit (con-
trol unit)
Refer to BRC-10, "
Component Parts
Location"
10. Stop lamp switch 11. ICC brake switch 12. IBA OFF switch
JSOIA0362ZZ
Revision: 2010 May2011 QX56

CCS-10
< SYSTEM DESCRIPTION >[ICC]
COMPONENT PARTS
Component Description
INFOID:0000000006224266
× : Applicable
13. Steering angle sensor
Refer to BRC-10, "
Component Parts
Location"
14. ADAS control unit
Refer to DAS-13, "
Component Parts
Location"
A. Back side of engine room (RH) B. Front bumper (center) C. Upper side of brake pedal
D. Under side of inst rument lower driver
panel
Component Function
Description
Vehicle-to-vehicle distance control mode
Conventional (fixed speed) cruise control mode Intelligent Brake Assist (IBA)
Brake Assist (with preview function)
ADAS control unit ×××× ADAS control unit calculates a target distance between vehicles
and a target speed, based on signals received from each sensor
and switch to transmit an engine torque command value to ECM
and a brake fluid pres sure control signal to ABS actuator and
electric unit (control unit) via CAN communication
 ADAS control unit transmits buzzer output signal to combination
meter via CAN communication
ICC sensor ×××× ICC sensor detects light reflected from a vehicle ahead by irra-
diating laser forward and calculates a distance from the vehicle
ahead and a relative speed, based on the detected signal
 ICC sensor transmits the presence/absence of vehicle ahead and the distance from the vehicle to ADAS control unit via ITS
communication
ECM ×××× ECM transmits the accelerator pedal position signal, ICC brake
switch signal, stop lamp switch signal, ICC steering switch sig-
nal, etc. to ADAS control unit via CAN communication
 ECM controls the electric throttle control actuator based on the engine torque demand received from the ADAS control unit via
CAN communication
ABS actuator and electric unit
(control unit) ×××× ABS actuator and electric unit (control unit) transmits the vehicle
speed signal (wheel speed), stop lamp signal and VDC/TCS/
ABS system operation condition to ADAS control unit via CAN
communication
 ABS actuator and electric unit (control unit) controls the brake, based on a brake fluid pressure control signal received from the
ADAS control unit via CAN communication
BCM ×BCM transmits the front wiper request signal to ADAS control unit
via CAN communication
TCM ××TCM transmits the signal related to A/T control to ADAS control
unit via CAN communication
Revision: 2010 May2011 QX56

CCS
COMPONENT PARTSCCS-11
< SYSTEM DESCRIPTION > [ICC]
C
D
E
F
G H
I
J
K L
M B
N P A
NOTE:
Only IBA system uses
Combination meter ××××Performs the following operations using the signals received from
the ADAS control unit via the CAN communication
 Displays the ICC system operation status using the meter dis-
play signal
 Illuminates the ICC system warning lamp using the ICC warning
lamp signal
 Illuminates the IBA OFF indicator lamp using the IBA OFF indi- cator lamp signal
 Operates the buzzer (ICC warning chime) using the buzzer out- put signal
ICC steering switch ×× ICC steering switch allows the ON/OFF of the Intelligent Cruise
Control and the settings of a vehicle speed and distance be-
tween vehicles
 ICC steering switch signal is transmitted to ECM. ECM transmits the signal to the ADAS control unit via CAN communication
ICC brake switch ×××× ICC brake switch is turned OFF and stop lamp switch is turned
ON, when depressing the brake pedal
 ICC brake switch signal is input to ECM. These signals are transmitted from ECM to ADAS control unit via CAN communi-
cation
 Stop lamp switch signal is in put to ECM and ABS actuator and
electric unit (control unit). These signals are transmitted from
ECM and ABS actuator and electric unit (control unit) to ADAS
control unit via CAN communication
Stop lamp switch
××××
ICC brake hold relay ××ICC brake hold relay activates the stop lamp by ICC brake hold re-
lay drive signal (stop lamp drive signal) outputted by the ADAS
control unit
Transfer control unit ××××Transfer control unit transmits a mode selection state of 4WD shift
switch to the ADAS control unit via CAN communication
IBA OFF switch ×
NoteIBA OFF switch signal is input to the ADAS control unit
Steering angle sensor ×Measures the rotation amount, rotation speed, and rotation direc-
tion of steering wheel, and then transmits them to ADAS control
unit via CAN communication
Component
Function
Description
Vehicle-to-vehicle distance control mode
Conventional (fixed speed) cruise control mode Intelligent Brake Assist (IBA)
Brake Assist (with preview function)
Revision: 2010 May2011 QX56